First you'll need to beat the game (all chapters, on any difficulty). After that, load the cleared game data and go to the Gates of Hell. In the Rodin's Treasure menu you can purchase the following costumes. Press RB at the beginning of a chapter to access the Costume Change menu.

• d'Arc - Purchase "Couture Bullet (d'Arc)" at Gates of Hell (100,000 Halos)
• Nun - Purchase "Couture Bullet (Nun)" at Gates of Hell (100,000 Halos)
• Old - Purchase "Couture Bullet (Old) at Gates of Hell (100,000 Halos)
• P.E. Uniform Type A - Purchase "Couture Bullet (P.E. Uniform)" at Gates of Hell (100,000 Halos)
• P.E. Uniform Type B - Purchase "Couture Bullet (P.E. Uniform)" at Gates of Hell (100,000 Halos)
• P.E. Uniform Type C - Purchase "Couture Bullet (P.E. Uniform)" at Gates of Hell (100,000 Halos)
• Queen - Purchase "Couture Bullet (Queen)" at Gates of Hell (100,000 Halos)
• Umbra - Purchase "Couture Bullet (Umbra)" at Gates of Hell (100,000 Halos)
• Umbran Komachi (Kimono) A - Purchase "Super Mirror" at Gates of Hell (100,000 Halos)
• Umbran Komachi (Kimono) B - Purchase "Super Mirror" at Gates of Hell (100,000 Halos)
• Umbran Komachi (Kimono) C - Purchase "Super Mirror" at Gates of Hell (100,000 Halos)
• Bikini A - Purchase "Couture Bullet (Various) at Gates of Hell (100,000 Halos)
• Bikini B - Purchase "Couture Bullet (Various) at Gates of Hell (100,000 Halos)
• Cheerleader - Purchase "Couture Bullet (Various) at Gates of Hell (100,000 Halos)

The following modes can be unlocked by performing the actions below:

• Hard - Beat the game on Normal
• Infinite Climax - Beat the game on Hard